Black Caps batsman Martin Guptill firmly believes the disastrous Twenty20 series is behind the Black Caps as they head into the first of five one-dayers against the West Indies.

Speaking to media ahead of the first match on Friday (NZ time) in Kingston, Guptill said the 2-0 Twenty20 series loss to the Windies hadn't dented their confidence.

"We're expecting to win, we're not just here to compete.

"We've got a good side here and we believe that we've got an opportunity to right the wrongs that happened in Miami and put up a good showing."

Guptill said the biggest focus after the Twenty20 series had been on ''role clarification'', with the players needing to adjust to playing together again after almost a month apart.

"We're a lot clearer on what we need to do now and we're going to work on that over the next couple of days.

"At the end of the day we just have to look at them (the West Indies) as another name. If the bowlers can do that and execute their plans well we're going to be in good shape to win these games."

The Black Caps, who will be captained by 21-year-old Kane Williamson in the absence of injured Ross Taylor and Brendon McCullum, slipped two places in the Twenty20 world rankings after their series sweep.

Guptill, who also slipped to No 2 in the Twenty20 batting rankings, said the absence of experienced players such as Taylor and McCullum would give the youngsters in the squad a chance to step up.

"Without Brendon and Ross in the side we lose a bit of that experience, we've got quite a young batting line-up but the guys are picked in this squad for a reason.

"It is disappointing to lose Ross. We all know he's a world class player and he's our captain as well and we miss his guidance. Kane stepped up well in that last match as captain and we've got that cover in the side."

The one-day series will finish with the fifth match on July 17 (NZT) and will be followed by a three-day warm up match against a West Indies selection and two tests.

- © Fairfax NZ News